Official: No evidence linking individual to Flight 370's disappearance

There remains no tangible evidence that links an individual to the disappearance of Malaysia Airlines Flight 370, a senior Malaysian law enforcement official told CBS News on Friday.

The official said while at the moment the passengers on MH370 have been "cleared," meaning their background checks have not revealed anything to raise alarm, that does not mean that the focus of the investigation has shifted towards the crew and pilots. According to the official, it means more investigation remains.

According to the official, as part of the investigation, police are also talking to everyone involved in the handling and consignment of the cargo on MH370. The cargo manifest for MH370 has so far not been made public. A request from CBS News for that document is pending.

Suspicion has fallen on pilot Zaharie Ahmad Shah and co-pilot Fariq Abdul Hamid, and investigators have now begun interviewing the families of the flight crew.

Jacquie Gonzales' husband, Patrick Gomez, was the chief steward on Flight 370.

She told CBS News that Malaysian police went to her home Tuesday and asked about Patrick's bank accounts, insurance and even his hobbies.

But the crucial missing link for investigators is the plane's wreckage - and especially its two black boxes, or flight recorders.

Crews searching for the missing jet launched a targeted underwater hunt on Friday for the plane's black boxes along a stretch of remote ocean, with just days left before the devices' batteries are expected to run out.